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It is an important area for wildlife, particularly with the major reserve at Monfragüe, which was designated a National Park in 2007, and the International Tagus River Natural Park (Parque Natural Tajo Internacional). The government of Extremadura is called Gobierno de Extremadura.

The Day of Extremadura is celebrated on 8 September. It coincides with the Catholic festivity of Our Lady of Guadalupe.

The basin of the Tagus (Spanish: Tajo), with two principal tributaries: on the right, the Tiétar and the Alagón; and on the left, the Almonte, Ibor, Salor and the Sever. The tributaries on the right edge carry a large quantity of water, which feed the gorges of the Sistema Central where the rainfall is abundant and the winter brings a great quantity of snow.

The yearly temperature fluctuates between an average minimum of 4 °C (39 °F) and an average maximum of 33 °C (91 °F). In the north of Extremadura, the average temperatures are lower than those in the south, with temperatures gradually rising south towards the Sierra Morena, where they drop because of the altitude.

During the summer, the average temperature in July is greater than 26 °C (79 °F), at times reaching 40 °C (104 °F).

The winters are mild, with the lowest temperatures being registered in the mountainous regions, with an average temperature of 7.5 °C (45 °F).

The average snowfall is 40 cm (16 in), mainly occurring in January and February.

As of January 1, 2012, the population of Extremadura is 1,109,367 inhabitants, representing 2.36% of the Spanish population (46,745,807).

The population density is very low—25/km2 (65/sq mi)—compared to Spain as a whole.

The most populous province is that of Badajoz, with a population of 691,715 and a population density of 31.78/km2 (82.3/sq mi). With an area of 21,766 km2 (8,404 sq mi), it is the largest province in Spain. 413,766 people live in the province of Cáceres at a density of 20.83/km2 (53.9/sq mi), having an area of 19,868 km2 (7,671 sq mi), making it the largest province in Spain after Badajoz.

Within the region of Extremadura, there live 29,068 foreign citizens, according to the INE census of January 1, 2007, of which 16,647 reside in the province of Badajoz and 12,421 in the province of Cáceres.

The largest immigrant community is Moroccan with 9,218 people, followed by Romanians with 4,324. There are 98 Icelanders and 6 Liechtensteiners. Brazilians account for 1,676 and Colombians make up 1,409. Of immigrants from Sub-Saharan Africa, the largest community is Senegalese with 88 people. Of those from Asia, the Chinese make up the largest group with 631 people. There are also 3,492 Portuguese people living within the region.

The Extremaduran population, according to the 1591 census of the provinces of the Kingdom of Castile, was around 540,000 people, making up 8% of the total population of Spain. No other census was performed until 1717, when 326,358 people were counted as living in Extremadura.

From this period, the population grew steadily until the 1960s (1,379,072 people in 1960[3]). After 1960, emigration to more prosperous regions of Spain and Europe drained the population.

Lusitania, an ancient Roman province approximately including current day Portugal (except for the northern area today known as Norte Region) and a central western portion of the current day Spain, covered in those times today's Autonomous Community of Extremadura. Mérida (now capital of Extremadura) became the capital of the Roman province of Lusitania, and one of the most important cities in the Roman Empire.

During the Andalusian period as of 711, present-day Extremadura was on the north-western marches—extremadura is from Latin words meaning literally "outermost hard", the outermost secure border (the march) of an occupied territory—with Mérida being its head city. It was part of the Umayyad Caliphate of Córdoba, but after its definite collapse in 1031 the Caliphate fragmented into small regional kingdoms, and the lands of Extremadura were included in the Taifa of Badajoz on two taifa periods. The kingdom in turn broke up twice under Almoravid and Almohad push (1094 and 1151). After the Almohad disaster in Navas de Tolosa (1212), Extremadura fell to the troops led by Alfonso IX of León in c.1230.

Wild Black Iberian pigs roam in the area and consume acorns from oak groves. These pigs are caught and used for the cured ham dish jamón ibérico. The higher the percentage of acorns eaten by the pigs, the more valuable the ham. For example, jamón ibérico from pigs whose diet consists of 90% acorns or more can be sold for more than twice as much as ham whose pigs ate on average less than 70% acorns.[citation needed] In the US, jamón ibérico directly from Extremadura, with bone, was illegal until around 2005. At that time, enough US restaurants were in demand for the delicacy that Spain decided to export it as boneless, which the US Department of Agriculture's health codes would approve (and continue to do).[citation needed]